Revert "restapi : AttachNetworkToVdsGroupCommand HTTP Status 500 - java.lang.NullPointerException(#961046)"

Reverting this change since:

	38	        String networkId = getNetworkId(network.getName(), clusterId);
	39	            network.setId(getNetworkId(network.getName(), clusterId));	39	        if (networkId == null) {
	40	            return handleError(Response.class, new BackendFailureException(
	41	                    "Bad network name: "+network.getName()), false);

here should be returned 404 error by not found

	42	        }
	43	        if (!network.isSetId()) {
	44	            network.setId(networkId);
	45	        }
	46	        else if (!network.getId().equals(networkId)) {
	47	            return handleError(Response.class, new BackendFailureException(
	48	                    "Network id provided does not match the id for network with name: "+
	49	                    network.getName()), false);

this is backend logic

	40	        }
        50	        }

This reverts commit 0888726b8e5c39cacaefd5af9242513507d86292.

Change-Id: I57ff677b72b82def25279b15e2d0c31bf70ffa7b
Signed-off-by: Michael Pasternak <mpastern@redhat.com>